There are 2 methods for adding Players to your Team.
1. Set a Join Password in your Team Profile and inform the individual of the password. They can then add themselves by visiting their My Teams page, selecting your Team from a list of Teams and entering the password. They will be added directly to the Team with "Member" status.
2. You can invite players to join your Team (note: you can't add them directly because it's the Player's choice as to whether or not they want to join your Team, not yours). To do this select the Roster tab from your Team Profile Control Panel, accessed via the Admin link :